根据看门狗电路的原理，设计出简单适用、性能可靠的1TrL型看门狗电路以及价格低廉、性能可靠的微功耗CMOS型看门狗电路，同时还介绍了常用的uP监视器O型看门狗电路。关键词：看门狗电路；1TrL型；CMOS型Abstract：In accordance with the principle of WDT (Watch Dog Timer 1circuit，design a，IT．L type WTD circuit，it is a dimple an d Applicable an d reliable on performanceo Design a CMOS type WTD circuit，it is low prices and mini-power consumption。Also the article describes a common uP type WTD circuit。Key word：WDT circuit；TFL type；CMOS typ e
上传时间： 2013-11-05
上传用户：685
PROTEUS VSM在单片机系统仿真中的应用:：介绍了单片机系统仿真工具PROTEUS VSM 及其在单片机系统仿真中的应用，给出了具体的应用实例，详细地介绍了PROTEUS VSM 与Keil uVision3的接口方法。关键词：单片机；Keil uVision3；仿真；外围器件；PROTEUS VSM； Abstract：This paper introduces the simulation tool for M CU system —PROTEUS VSM ， and presents the application ofPROTEUS VSM in MCU system simulation through an Applicable example．The way of interfacing PROTEUS VSM to Keil uVision3is also presented in details．Keywords：MCU ；Keil uVision3；simulation；peripheral devices；PROTEUS VSM ；
上传时间： 2013-11-16
上传用户：chenxichenyue
MPC7400 Part Number SpeciÞcationThis document describes part number speciÞc changes to recommended operating conditions and revised electrical speciÞcations,as Applicable, from those described in the generalMPC7400 Hardware SpeciÞcations.SpeciÞcations provided in this Part Number SpeciÞcation supersede those in theMPC7400 Hardware SpeciÞcationsdated 9/99(order #: MPC7400EC/D) for these part numbers only; speciÞcations not addressed herein are unchanged. This document isfrequently updated, refer to the website at http://www.mot.com/SPS/PowerPC/ for the latest version.Note that headings and table numbers in this data sheet are not consecutively numbered. They are intended to correspond to theheading or table affected in the general hardware speciÞcation.
上传时间： 2014-12-28
上传用户：huyahui
This document describes part number speciÞc changes to recommended operating conditions and revised electrical speciÞcations,as Applicable, from those described in the generalMPC7400 Hardware SpeciÞcations.SpeciÞcations provided in this Part Number SpeciÞcation supersede those in theMPC7400 Hardware SpeciÞcationsdated 9/99(order #: MPC7400EC/D) for these part numbers only; speciÞcations not addressed herein are unchanged. This document isfrequently updated, refer to the website at http://www.mot.com/SPS/PowerPC/ for the latest version.Note that headings and table numbers in this data sheet are not consecutively numbered. They are intended to correspond to theheading or table affected in the general hardware speciÞcation.Part numbers addressed in this document are listed in Table A. For more detailed ordering information see Table B.
上传时间： 2013-11-19
上传用户：qiaoyue
The standard that governs the design of avioniccomponents and systems, DO-254, is one of the mostpoorly understood but widely Applicable standardsin the avionic industry. While information on thegeneral aspects of the standard is easy to obtain, thedetails of exactly how to implement the standard aresketchy. And once an entity develops a process thatachieves compliance, the details of how compliancewas achieved become part of the intellectualproperty of that entity. This white paper focuses onthe details of developing a DO-254 compliantprocess for the design of FPGAs.
上传时间： 2013-11-12
上传用户：q123321
The standard that governs the design of avioniccomponents and systems, DO-254, is one of the mostpoorly understood but widely Applicable standardsin the avionic industry. While information on thegeneral aspects of the standard is easy to obtain, thedetails of exactly how to implement the standard aresketchy. And once an entity develops a process thatachieves compliance, the details of how compliancewas achieved become part of the intellectualproperty of that entity. This white paper focuses onthe details of developing a DO-254 compliantprocess for the design of FPGAs.
上传时间： 2013-11-03
上传用户：ysystc670
This document provides practical, common guidelines for incorporating PCI Express interconnect layouts onto Printed Circuit Boards (PCB) ranging from 4-layer desktop baseboard designs to 10- layer or more server baseboard designs. Guidelines and constraints in this document are intended for use on both baseboard and add-in card PCB designs. This includes interconnects between PCI Express devices located on the same baseboard (chip-to-chip routing) and interconnects between a PCI Express device located “down” on the baseboard and a device located “up” on an add-in card attached through a connector. This document is intended to cover all major components of the physical interconnect including design guidelines for the PCB traces, vias and AC coupling capacitors, as well as add-in card edge-finger and connector considerations. The intent of the guidelines and examples is to help ensure that good high-speed signal design practices are used and that the timing/jitter and loss/attenuation budgets can also be met from end-to-end across the PCI Express interconnect. However, while general physical guidelines and suggestions are given, they may not necessarily guarantee adequate performance of the interconnect for all layouts and implementations. Therefore, designers should consider modeling and simulation of the interconnect in order to ensure compliance to all Applicable specifications. The document is composed of two main sections. The first section provides an overview of general topology and interconnect guidelines. The second section concentrates on physical layout constraints where bulleted items at the beginning of a topic highlight important constraints, while the narrative that follows offers additional insight.
上传时间： 2014-01-24
上传用户：s363994250
在Multisim 10软件环境下，设计一种由运算放大器构成的精确可控矩形波信号发生器，结合系统电路原理图重点阐述了各参数指标的实现与测试方法。通过改变RC电路的电容充、放电路径和时间常数实现了占空比和频率的调节，通过多路开关投入不同数值的电容实现了频段的调节，通过电压取样和同相放大电路实现了输出电压幅值的调节并提高了电路的带负载能力，可作为频率和幅值可调的方波信号发生器。Multisim 10仿真分析及应用电路测试结果表明，电路性能指标达到了设计要求。 Abstract: Based on Multisim 10， this paper designed a kind of rectangular-wave signal generator which could be controlled exactly composed of operational amplifier， the key point was how to implement and test the parameter indicators based on the circuit diagram. The duty and the frequency were adjusted by changing the time constant and the way of charging and discharging of the capacitor， the width of frequency was adjusted by using different capacitors provided with multiple switch， the amplitude of output voltage was adjusted by sampling voltage and using in-phase amplifier circuit，the ability of driving loads was raised， the circuit can be used as squarewave signal generator whose frequency and amplitude can be adjusted. The final simulation results of Multisim 10 and the tests of Applicable circuit show that the performance indicators of the circuit meets the design requirements.
上传时间： 2014-01-21
上传用户：shen007yue
This application note discusses a variety of approaches for interfacing analog signals to 5V powered systems. Synthesizing a "rail-to-rail" op amp and scaling techniques for A/D converters are covered. A voltage-to-frequency converter, Applicable where high resolution is required, is also presented.
上传时间： 2013-10-12
上传用户：181992417
Support is available from MIPS Technologies Inc. - problems should be addressed to support@mips.com。This product may be controlled for export purposes. You may not export, or transfer for the purpose of reexport, any technical data received hereunder or the product produced by use of such technical data, including processes and services (the "product"), in violation of any U.S. or foreign regulation, treaty, Executive Order, law, statute, amendment or supplement thereto. Further, you may not export the product to any prohibited or embargoed country or to any denied, blocked, or designated person or entity as mentioned in any Applicable U.S. or foreign regulation, treaty, Executive Order, law, statute, amendment or supplement thereto.
标签： Technologies available addressed problems
上传时间： 2014-01-24
上传用户：二驱蚊器
